CN205051308U - L type concrete cable pit prefab - Google Patents

Abstract

The utility model relates to an L-shaped concrete cable trench prefabricated part, which comprises an L-shaped concrete body, and the side wall of the concrete body is arranged with side wall stress ribs along the height direction and side wall distribution ribs along the length direction. , the bottom plate of the concrete body is arranged with bottom plate stress ribs along the width direction and bottom plate distribution ribs along the length direction, one end of the bottom plate stress ribs is connected with the side wall stress ribs, and the bottom plate stress ribs are another One end extends from the inner surface of the bottom plate and forms a connecting section; the front and rear ends of the concrete body are also reserved with semicircular grooves for installing water-expandable water-stop strips, and the front and rear side walls of the concrete body Two upper and lower iron parts are pre-embedded at both ends respectively, and bolt holes are respectively opened on lugs on both sides of the iron parts. Compared with the existing U-shaped prefabricated parts, the utility model has better adaptability and flexibility, and lower manufacturing cost, transportation cost, hoisting cost and maintenance cost.

Description

L-shaped concrete cable trench prefabricated parts

technical field

The utility model relates to an L-shaped concrete cable trench prefabricated part, which belongs to the technical field of cable trenches.

Background technique

The traditional cable trench is generally a brick structure or cast-in-place concrete structure. For a long time, it has been used to purchase sand, bricks, steel bars, cement and other construction materials on site, and bind steel bars on site, formwork, mix concrete, pour, maintain, Masonry fills walls and traditional patterns such as stucco. Although it has a long history and mature technology, it has its own insurmountable shortcomings. For example, the strength of the brick cable trench is low, the manual masonry construction is heavy, and the construction process is not in place, resulting in quality defects and cracks in the trench; while the construction period and maintenance time of the concrete cable trench are long, and it is impossible to construct and maintain in winter in cold regions. Or if the vibrating process is not in place, it will easily lead to quality defects such as honeycomb pitting, lack of flute and corners, cracking, etc. The uneven technical level of the construction team makes the project quality very uneven.

The prefabricated cable trench is a new type of cable trench in recent years. Prefabricated parts can overcome the shortcomings of difficult on-site construction quality control, long construction period, and difficult civilized management, and effectively improve the construction efficiency and economic benefits of substations. At present, there are relevant research results of "U"-shaped finished cable trench prefabrication in China. The method is to develop a specific mold according to the cable trench size (width and depth) required by the project, and set up steel bars in the mold. , Pour concrete, and form finished prefabricated parts after vibrating, initial setting, demoulding, curing, finishing and modification. In addition to concrete materials, there are also glass fiber reinforced plastics and resin composite materials. The prefabricated part is in the shape of "U". Generally, the length of a single prefabricated part is within 1m, and each prefabricated part is provided with male and female grooves at the head and tail. After the finished prefabricated parts are transported to the construction site of the substation, a layer of 100mm thick C15 plain concrete cushion is poured in the excavated cable trench foundation groove, and then the finished cable trench is hoisted in place along the length of the trench with hoisting equipment, adjusted Good levelness, top, bottom, left and right alignment, head and tail male and female slots docked, and assembled section by section. After the assembly is completed, the seams are jointed with waterproof mortar to complete the construction of the cable trench body.

Although the existing U-shaped prefabricated parts greatly reduce the on-site construction workload of traditional cable trenches, speed up the construction progress, and improve the level of civilized construction management, the development of specific molds for each specification of cable trenches obviously cannot effectively reduce the cost of prefabricated parts. production cost. Due to the limited shape of the U-shaped prefabricated parts, the transportation cost is relatively high. Secondly, the existing U-shaped prefabricated head and tail male and female groove butt joints and waterproof mortar pointing joints cannot cope with the uneven settlement of the ditch due to foundation deformation during long-term use, which will inevitably cause cracking and damage to the ditch, thus losing the cable The waterproof performance of the ditch even affects the normal operation of the substation. In addition, the splicing method of the existing U-shaped cable trench makes it impossible to install drainage facilities in the trench. Therefore, a small section of brick trench or cast-in-place concrete trench must be made at intervals to arrange sump pits and Burying drainage pipes makes it impossible to achieve zero-formwork construction in the true sense, and restricts the construction period to a certain extent.

Utility model content

In order to overcome the shortcomings of existing U-shaped prefabricated parts in terms of research and development cost, transportation cost, installation mode and operational reliability, the technical problem to be solved by the utility model is to provide a new structure, low cost, convenient transportation, convenient construction and Use reliable L-shaped concrete cable trench prefab.

In order to solve the above problems, the technical solution of the utility model is: an L-shaped concrete cable trench prefabricated part, including an L-shaped concrete body, and side wall stress ribs along the height direction are arranged in the side wall of the concrete body and the side wall distribution ribs along the length direction, the bottom plate of the concrete body is arranged with the bottom plate stress ribs along the width direction and the bottom plate distribution ribs along the length direction, one end of the bottom plate stress ribs is connected with the side wall stress ribs connection, the other end of the stress rib of the bottom plate extends from the inner surface of the bottom plate and forms a connecting section; the front and rear ends of the concrete body are respectively reserved with semicircular grooves for installing water-swellable water-stop strips , the front and rear ends of the side wall of the concrete body are pre-embedded with two upper and lower iron parts respectively, and the lugs on both sides of the iron parts are respectively provided with bolt holes.

Further, a plurality of bolts extending from the inner surface of the side wall are pre-embedded in the side wall of the concrete body for installation of the cable bracket.

Further, the top surface of the bottom plate of the concrete body is an inward and downward slope.

Further, the top of the side wall of the concrete body is symmetrically provided with two hoisting holes for assembly.

Further, a plurality of evenly distributed rubber pad holes are reserved on the top of the side wall of the concrete body.

Compared with the prior art, the utility model has the following beneficial effects:

(1) In terms of research and development, the section formed by the combination of two L-shaped prefabricated parts can adapt to different cable trench widths, which greatly reduces the number of mold research and development. A set of molds can be used for more widths and larger batches of cable trenches The production of prefabricated parts greatly reduces the cost of prefabricated parts.

(2) Due to the small size of the L-shaped prefabricated parts, it is easier to organize and stack them than the U-shaped prefabricated parts during transportation, which means that the number of single vehicles can be greatly increased, and the transportation cost is effectively reduced. At the same time, due to the light weight of the L-shaped prefabricated parts, the loading and unloading can be completed with small mobile cranes, and even in the case of insufficient conditions, it can be manually loaded and unloaded and installed in place, which greatly improves the flexibility.

(3) The connection method of the L-shaped prefabricated parts is bolt connection, and water-swelling waterstops are installed at the joints. While meeting the waterproof requirements of the cable trench, thanks to the strength and reliability of the bolt connection, it can effectively control long-term operation. The uneven settlement of the cable trench caused by the post-foundation deformation improves the reliability of the cable trench operation and reduces maintenance costs.

(4) Since there is a concrete post-casting area in the middle of the channel composed of L-shaped prefabricated parts, drainage pipes can be flexibly set, and there is no need to make traditional brickwork or cast-in-place concrete trench sections at a certain distance. In terms of channel drainage It is more flexible, and truly realizes zero formwork construction, which improves efficiency.

Description of drawings

Figure 1 is the front view of the prefabricated L-shaped concrete cable trench.

Figure 2 is a cross-sectional view of the prefabricated L-shaped concrete cable trench.

Fig. 3 is the right view of the prefabricated L-shaped concrete cable trench.

Figure 4 is a top view of the prefabricated L-shaped concrete cable trench.

Figure 5 is a cross-sectional view of the assembled cable trench.

Figure 6 is a top view of the assembled cable trench.

Markings in the figure: 100-L-type prefabricated parts, 101-concrete body, 102-semicircular groove, 103-hoisting hole, 104-rubber pad hole, 110-side wall, 111-side wall stress rib, 112- Side wall distribution reinforcement, 120-bottom plate, 121-bottom plate stress reinforcement, 122-bottom plate distribution reinforcement, 123-slope, 130-iron parts, 131-bolt hole, 140-bolt, 200-bolt, 300-C15 plain concrete Cushion, 400-drainage pipe, 500-concrete, 600-water-swellable water-stop strip.

detailed description

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

As shown in Figures 1 to 4, an L-shaped concrete cable trench prefabricated part includes an L-shaped concrete body 101, the side wall 110 of the concrete body 101 is arranged with side wall stress ribs 111 along the height direction and Distributed ribs 112 along the side wall along the length direction, bottom plate stress ribs 121 along the width direction and bottom plate distribution ribs 122 along the length direction are arranged in the bottom plate 120 of the concrete body 101, one end of the bottom plate stress ribs 121 is connected to the side The wall stress ribs 111 are connected, and the other end of the bottom plate stress ribs 121 extends from the inner surface of the bottom plate 120 to form a connecting section; the front and rear ends of the concrete body 101 are also reserved for installation of water-swelling ribs. In the semicircular groove 102 of the waterstop 600, two upper and lower iron parts 130 are pre-embedded at the front and rear ends of the side wall 110 of the concrete body 101, respectively, and the lugs on both sides of the iron part 130 are respectively provided with bolt holes 131 .

In the embodiment of the present utility model, four bolts 140 extending from the inner surface of the sidewall 110 for the installation of the cable bracket are embedded in the side wall 110 of the concrete body 101, and the four bolts 140 have a shape of 2×2 The top-bottom symmetric distribution of the array.

In the embodiment of the present utility model, the top surface of the bottom plate 120 of the concrete body 101 is a slope 123 inclined inward and downward, so that water collects in the middle of the bottom plate 120 of the cable trench and drains from the drain pipe 400 to the inspection well.

In the embodiment of the present invention, the top of the side wall 110 of the concrete body 101 is symmetrically provided with two hoisting holes 103 for assembling. Three evenly distributed rubber pad holes 104 are reserved on the top of the side wall 110 of the concrete body 101 for placing rubber pads.

The design method of the prefabricated L-shaped concrete cable trench considers the stressed state of the cable trench under normal use and the stressed state during hoisting. During design, based on a certain foundation bearing capacity, soil bulk density and internal friction angle, groundwater depth, ground live load and the load when the cable trench accommodates the maximum number of cables, the internal force of the cable trench side wall and bottom plate is calculated, and the L-shaped concrete cable is derived The thickness and reinforcement required for the prefabricated part of the trench, and the cracks of the prefabricated part of the L-shaped concrete cable trench under normal operating conditions are checked and checked. After meeting the requirements, provide data such as section size and reinforcement for the processing of molds and related parts. All design input data should be sufficiently representative so that the designed member cross-section and reinforcement values can be suitable for most engineering situations.

The production process of the L-shaped concrete cable trench prefabrication includes the following steps: (1) configuring concrete mixture; (2) erecting steel bars (including stress bars and distribution bars) and iron parts 130 in the mold; (3) Put the configured concrete mixture into the mold; (4) Vibration forming, inspection, refilling and then vibration; (5) demoulding maintenance, inspection, modification treatment, inspection after passing the warehouse, waiting to be transported to the site for assembly.

In the embodiment of the utility model, the concrete mixture in step (1) is made of ordinary portland cement as the main cementitious material, and is equipped with coarse sand (soil residue and impurities need to be removed), graded gravel, waterproof Anti-corrosion agent, etc. (added according to the actual situation of the project), and stirred according to the set ratio to form concrete with certain waterproof performance.

In the embodiment of the present utility model, step (2) also erects a plurality of bolts 140 for installing the cable bracket in the mold. Wherein, the steel bars may be cold-rolled ribbed steel bars.

In the embodiment of the present utility model, the length of the L-shaped concrete cable trench prefabricated part formed in step (4) is usually within 1 m.

As shown in Figures 5-6, the on-site assembly process of the L-shaped concrete cable trench prefabricated part (hereinafter referred to as: L-shaped prefabricated part) is as follows: before paving, in the semicircular groove 102 at the front and rear ends of the L-shaped The water-swellable water-stop strips 600 are respectively placed and fixed by their own viscosity. When paving, first lay a layer of 100mm thick C15 plain concrete cushion 300 in the excavated cable trench foundation groove, and lay a dry hard cement mortar layer about 30mm thick on it for leveling and alignment of prefabricated parts; then Hoist the L-shaped prefabricated parts 100 section by section in turn, and after alignment, lock the bolt holes 131 reserved at the head and tail of the L-shaped prefabricated parts 100 with bolts 200 to complete the installation of the ditch section; finally, in the two rows of L-shaped prefabricated Concrete 500 is poured in the area between the bottom plates 120 of the prefabricated part 100, and the concrete 500 is poured as it is poured. After the pouring and maintenance are completed, the construction of the cable trench body is completed.

The specific paving process and process are as follows:

(1) According to the design requirements of the cable trench, excavate the foundation trench into a certain prototype trench body, and lay a 100mm thick C15 plain concrete cushion 300 on the bottom to cover it. According to the design requirements, a drainage pipe 400 is arranged at a certain distance in the cable trench, and connected to a nearby inspection well. The cushion layer should be covered and watered within 12 hours after pouring and tamping, and the curing time is generally not less than 7 days.

(2) Install a small mobile crane, or prepare a small excavator for installation, and prepare to assemble the finished cable trench.

(3) Transport the L-shaped prefabricated parts 100 section by section with a forklift to the two sides of the foundation groove of the cable trench and arrange them, remove the mud and impurities at the bottom of the cable trench, and prepare for hoisting in place.

(4) Fasten the sling, lift the L-shaped prefabricated part 100 lightly, and place it stably on the C15 plain concrete cushion 300 that has been prepared. Before placing, a 30mm thick dry and hard cement mortar layer should be set on the cushion layer, and the L-shaped prefabricated part 100 should be hung on the cement mortar layer, and the levelness should be adjusted, and then assembled one by one.

(5) During the assembly process, workers should constantly use a spirit level or level ruler to adjust and align each section of L-shaped prefabricated parts 100. The left, right, upper, lower, and horizontal planes cannot exceed the allowable deviation range, generally not exceeding 2mm.

(6) Assemble the L-shaped prefabricated part 100 on the other side in the same manner.

(7) After all the L-shaped prefabricated parts 100 on both sides are assembled, the connecting sections of the bottom plate stress ribs 121 between the L-shaped prefabricated parts 100 on both sides are connected correspondingly by means of single-sided welding 10d, and the bottom plate distribution ribs are laid out 122, and then pour concrete 500 (such as micro-expansion fine stone concrete) into the gap between the bottom plates 120 of the L-shaped prefabricated parts 100 on both sides. And mixed with about 12% UEA expansion agent. When pouring and pounding, it should be poured into an inclined surface according to the drainage direction of the design drawing, with a slope direction of 400 to the drainage pipe and a slope of 0.3% to 0.5%.

(8) After the maintenance is completed, the cable trench can be delivered for electrical installation. Since the bolts 140 for installing the cable support are pre-buried in the ditch wall, there is no need to apply additional expansion bolts, and the cable support is directly installed on the reserved bolts 140, and the cable can be laid after locking with nuts.

Different from the existing U-shaped prefabricated parts, U-shaped prefabricated parts develop molds according to the width and depth of the cable trench, which means that each set of molds is only suitable for a specific cross-section of the cable trench. In actual engineering, since there are various sizes of cable trenches in a substation, if a specific mold is developed for each specification of cable trenches, the construction cost will undoubtedly be greatly increased. However, the L-shaped prefabricated part of the utility model has better adaptability and flexibility. By splicing two L-shaped prefabricated parts face to face, a "U"-shaped cable trench section can be formed, and the distance between the two L-shaped prefabricated parts can be adjusted. After the distance, the floor gap between the two L-shaped prefabricated parts is filled with cast-in-place concrete, and different cable trench widths can be combined to meet the size requirements of various cable trenches, and drainage can be set at any position in the post-casting area Therefore, it has better adaptability and flexibility, further reduces the component manufacturing cost and transportation cost of the prefabricated cable trench, reduces the requirements for hoisting equipment, and improves the construction efficiency.

In addition, in terms of the connection method, the existing U-shaped prefabricated parts are butted with male and female grooves at the head and tail, and the joints are jointed with waterproof mortar. Although the waterproof mortar has a certain waterproof performance, due to its low strength, during the long-term operation process, the uneven settlement of the ditch due to the deformation of the foundation will cause damage and deformation of the connection, resulting in the loss of the waterproof performance of the cable trench. However, the L-shaped prefabricated part of the present utility model is not provided with male and female grooves at both ends of the component, but a semicircular groove with a diameter of 10 mm is reserved at both ends of the component, filled with water-swellable water-stop strips, and the gap between the components Lock with bolts. Bolt connection not only has a fast construction speed, but also has much higher strength than waterproof mortar. Even if the foundation deforms after long-term operation, it can effectively restrain the uneven settlement of the cable trench and continuously maintain the waterproof performance of the cable trench. Compared with the current U-shaped prefabricated cable trench technology, it has higher reliability and lower operation and maintenance costs.

Therefore, the L-shaped prefabricated part of the utility model has better engineering adaptability and use flexibility than the existing U-shaped prefabricated part, and better adaptability brings greater batch production of components, which means lower R&D Manufacturing cost, lighter and smaller body brings lower transportation cost and hoisting cost, faster and stronger bolt connection method makes it have higher operation reliability and lower operation and maintenance cost.

The utility model is not limited to the above-mentioned best implementation mode, anyone can draw other various forms of L-shaped concrete cable trench prefabricated parts under the enlightenment of the utility model. All equivalent changes and modifications made according to the patent scope of the utility model should belong to the scope of the utility model.

Claims (5)

1. A L-shaped concrete cable trench prefabricated part, comprising an L-shaped concrete body, characterized in that: the side wall of the concrete body is arranged with a side wall stress rib along the height direction and a side wall along the length direction Distributing ribs, the bottom plate of the concrete body is arranged with bottom plate stress ribs along the width direction and bottom plate distribution ribs along the length direction, one end of the bottom plate stress ribs is connected with the side wall stress ribs, and the bottom plate is stressed The other end of the rib extends from the inner surface of the bottom plate and forms a connecting section; the front and rear ends of the concrete body are also reserved with semicircular grooves for installing water-swellable water-stop strips, and the side of the concrete body Two upper and lower iron parts are pre-embedded at the front and rear ends of the wall respectively, and the lugs on both sides of the iron parts are respectively provided with bolt holes. 2. The L-shaped concrete cable trench prefabricated part according to claim 1, characterized in that: the side wall of the concrete body is pre-embedded with a plurality of bolts extending from the inner surface of the side wall for cable support installation . 3. The L-shaped concrete cable trench prefabricated part according to claim 1, characterized in that: the top surface of the bottom plate of the concrete body is a slope surface inclined inward and downward. 4. The L-shaped concrete cable trench prefabricated part according to claim 1, characterized in that: the top of the side wall of the concrete body is symmetrically provided with two hoisting holes for assembly. 5. The L-shaped concrete cable trench prefabricated part according to claim 1, wherein a plurality of evenly distributed rubber pad holes are reserved on the top of the side wall of the concrete body.